My NUC refuses to boot with both modules installed (power LED blinks 3 times). I tried either of the modules separately in the bottom slot and either boots fine. I have BIOS version 0137. The memory issue troubleshooting page is not very helpful (Intel® NUC Boards and Kits — Troubleshooting Memory Issues), but based on my understanding the dual SODIMM configuration should work with my NUC.

The memory configuration in BIOS is the following (presumably from SPD, since the memory settings are set to automatic):

- CLK 133MHz

- tCL 11

- tRCD 11

- tRP 11

- tRAS 28

- voltage 1.35

This is with a single module installed. Unfortunately I cannot see what it is when I put both modules in, since the NUC does not POST.

Do you know if you guys have the recommended timing configuration for this memory in dual module config? The memory page lists it as tested - would it be possible to get this information from the validation team?

Exact same problem on my NUC5i5RYK as well. Will not boot when anything is plugged into the top memory slot. I'm using Crucial 4x2 GB (CT51264BF160BJ) memory. I am able to boot with the lower slot populated only.

We tested with CT51264BF160BJ.C8FER and this RAM works properly. You may need to check with RAM manufacturer if this part number is the same or if it complies with SDRAM density and organization listed in Technical Product Specification (page 19).

The modules I've got have C8FND extension - CT51264BF160BJ.C8FND. Which means the memory I have is useless. I believe I have been misled by the original memory compatibility list - what recourse do I have available?

I have same issue with NUC515RYH and Crucial CT51264bf160BJ.C8FND. Either DIMM will work alone in lower slot. If either is moved alone to upper slot, or if both are installed it fails to boot with 3 blinks. Seems like we need a new BIOS or a new manual setting from Intel to make these DIMMS work.

I bought both the NUC and the DIMMS from the Intel EPP store.

Only difference I can find in the .C8FND vs .C8FER is one is code for single 4Gbx1 DIMM and other is code for Dual 4Gbx2 DIMM Kit from Crucial.